From bd18f549e7e88c9b3121d7db6502ecb362149004 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 27 Jun 2003 08:23:23 +0000
Subject: add mmap64 for i386

---
 libc/sysdeps/linux/i386/Makefile |   2 +-
 libc/sysdeps/linux/i386/mmap64.S | 112 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+), 1 deletion(-)
 create mode 100644 libc/sysdeps/linux/i386/mmap64.S

(limited to 'libc')

diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile
index c7e1db947..b3bb06df6 100644
--- a/libc/sysdeps/linux/i386/Makefile
+++ b/libc/sysdeps/linux/i386/Makefile
@@ -25,7 +25,7 @@ CRT0_OBJ = crt0.o crt1.o gcrt1.o
 CRT0_DEPS=gmon-start.S
 
 SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
-	bsd-_setjmp.S syscall.S
+	bsd-_setjmp.S syscall.S mmap64.S
 ifeq ($(strip $(UCLIBC_PROFILING)),y)
 SSRC+=mcount.S
 endif
diff --git a/libc/sysdeps/linux/i386/mmap64.S b/libc/sysdeps/linux/i386/mmap64.S
new file mode 100644
index 000000000..b5d948878
--- /dev/null
+++ b/libc/sysdeps/linux/i386/mmap64.S
@@ -0,0 +1,112 @@
+/* Copyright (C) 1995,96,97,98,99,2000,2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+#define _ERRNO_H	1
+#include <features.h>
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+#if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2
+
+
+#define LINKAGE     4
+#define PTR_SIZE    4
+#define SVRSP	16		/* saved register space */
+#define PARMS	LINKAGE+SVRSP	/* space for 4 saved regs */
+#define ADDR	PARMS
+#define LEN	ADDR+PTR_SIZE
+#define PROT	LEN+4
+#define FLAGS	PROT+4
+#define FD	FLAGS+4
+#define OFFLO	FD+4
+#define OFFHI	OFFLO+4
+
+        .text
+	.globl mmap64;
+	.type mmap64,@function;
+	.align 1<<4;
+
+mmap64:
+	/* Save registers.  */
+	pushl %ebp
+	pushl %ebx
+	pushl %esi
+	pushl %edi
+
+	movl OFFLO(%esp), %edx
+	movl OFFHI(%esp), %ecx
+	testl $0xfff, %edx
+	jne L_einval
+	shrdl $12, %ecx, %edx		/* mmap2 takes the offset in pages.  */
+	shrl $12, %ecx
+	jne L_einval
+	movl %edx, %ebp
+
+	movl ADDR(%esp), %ebx
+	movl LEN(%esp), %ecx
+	movl PROT(%esp), %edx
+	movl FLAGS(%esp), %esi
+	movl FD(%esp), %edi
+
+	movl $_NR_mmap2, %eax	/* System call number in %eax.  */
+	int $0x80
+
+	/* Restore registers.  */
+	popl %edi
+	popl %esi
+	popl %ebx
+	popl %ebp
+
+	/* If 0 > %eax > -4096 there was an error.  */
+	cmpl $-4095,%eax
+	jae __syscall_error
+	ret
+
+	/* This means the offset value is too large.  */
+L_einval:
+	popl %edi
+	popl %esi
+	popl %ebx
+	popl %ebp
+	movl $-EINVAL, %eax
+	jmp __syscall_error
+
+
+__syscall_error:
+	negl    %eax
+	pushl   %eax
+#ifdef __PIC__
+	call .Lthere
+.Lthere:
+	popl	%ebx
+	addl	$_GLOBAL_OFFSET_TABLE_+[.- .Lthere  ], %ebx
+	call    __errno_location@PLT
+#else
+	call	__errno_location
+#endif
+	popl	%ecx
+	movl	%ecx, (%eax)
+	xorl	%eax, %eax
+	decl	%eax
+
+.Lsize:
+	.size	 mmap64,.Lsize-mmap64
+
+#endif
+
-- 
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